US4311208AExpiredUtility
Ladder safety lamp
Individually held — no corporate assignee on recordPriority: Jul 18, 1980Filed: Jul 18, 1980Granted: Jan 19, 1982
Est. expiryJul 18, 2000(expired)· nominal 20-yr term from priority
E06C 7/003
73
PatentIndex Score
47
Cited by
4
References
8
Claims
Abstract
A warning light assembly for use on ladders having a plurality of rungs to indicate the presence of someone on the ladder. The warning light assembly has a switch activated by a person's foot placed on one of the lower rungs of the ladder. When first activated, the switch turns on a flashing light positioned about eye level. As the person disembarks from the ladder, his foot on the lower rung again activates the switch turning off the flashing light.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. A warning signal assembly for use on ladders having a plurality of rungs to indicate the presence of someone on the ladder, said warning signal assembly comprising: switch means activated by a person's foot placed on one of the lower rungs, said switch means activating signal means, said signal means being deactivated by a person's foot placed on one of said lower rungs.
2. The assembly of claim 1 wherein said switch means is positioned above the lowermost rung.
3. The assembly of claim 1 wherein said signal means comprises light means.
4. The assembly of claim 3 wherein said signal means is a flashing light.
5. The assembly of claim 1 wherein said switch means is activated by the interruption of a light beam.
6. The assembly of claim 1 wherein said signal means is a light source and photocell positioned above the lowermost rung.
7. The assembly of claim 6 wherein said signal means is a flashing light.
8. The assembly of claim 7 wherein said flashing light is positioned at about eye level below one of said rungs.Join the waitlist — get patent alerts
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